The Bookmarks Manager bug will likely not be fixed in any 2.49.x release. The places api changed too much. I took a sledgehammer and ported the Firefox Library for 2.53+. See Bug 1378089. I can provide a test 2.53 but be aware that this one does not contain all backported 2.49.2 security fixes.

Where can I get the mentioned test?Should I report my findings here or elsewhere?